Find the range of \[f(x)=sgn({{x}^{2}}-2x+3).\]

1.	Find the range of \[f(x)=sgn({{x}^{2}}-2x+3).\]
A.	\[\{1,-1\}\]
B.	\[\{1\}\]
C.	\[\{-1\}\]
D.	None of these
Answer» C. \[\{-1\}\]

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Find the range of \[f(x)=sgn({{x}^{2}}-2x+3).\]

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